Cyclone 2 Shoe Size:8.5 semi-rimless frame designed to increase

semi-rimless frame designed to increase field of view and improved ventilation

from your 1st run to last run

Actuator is kept in place no matter the activity level

the Structure 25 supports you for long miles

With Altra’s signature FootShape™ fit

Cyclone 2 Shoe Size:8.5 semi-rimless frame designed to increaseDiscover our lightest and fastest shoe ever. The new upper features an airy mesh for excellent breathability, with a fit so light and secure it disappears around the foot as you move. The new full Pebax Powered performance midsole delivers a highly responsive, seriously lightweight, and energetic ride. The rocker design aids in a fast transition, while the lightweight die cut rubber outsole offers weight relief with optimal traction and durability.